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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-28 09:13:47 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-28 09:13:47 +0000
commit102b0d2daa97dae68d3eed54d8fe37a9cc38a892 (patch)
treebcf648efac40ca6139842707f0eba5a4496a6dd2 /drivers/imx/uart
parentInitial commit. (diff)
downloadarm-trusted-firmware-102b0d2daa97dae68d3eed54d8fe37a9cc38a892.tar.xz
arm-trusted-firmware-102b0d2daa97dae68d3eed54d8fe37a9cc38a892.zip
Adding upstream version 2.8.0+dfsg.upstream/2.8.0+dfsgupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/imx/uart')
-rw-r--r--drivers/imx/uart/imx_crash_uart.S131
-rw-r--r--drivers/imx/uart/imx_uart.c181
-rw-r--r--drivers/imx/uart/imx_uart.h163
3 files changed, 475 insertions, 0 deletions
diff --git a/drivers/imx/uart/imx_crash_uart.S b/drivers/imx/uart/imx_crash_uart.S
new file mode 100644
index 0000000..aa987b3
--- /dev/null
+++ b/drivers/imx/uart/imx_crash_uart.S
@@ -0,0 +1,131 @@
+/*
+ * Copyright (c) Linaro 2018 Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+#include <arch.h>
+#include <asm_macros.S>
+#include <assert_macros.S>
+#include <imx_uart.h>
+#include <platform_def.h>
+
+ .globl imx_crash_uart_init
+ .globl imx_crash_uart_putc
+
+ /* -----------------------------------------------
+ * int imx_crash_uart_init(uintptr_t base_addr,
+ * unsigned int uart_clk, unsigned int baud_rate)
+ * Function to initialize the console without a
+ * C Runtime to print debug information. This
+ * function will be accessed by console_init and
+ * crash reporting.
+ * In: r0 - console base address
+ * r1 - Uart clock in Hz
+ * r2 - Baud rate
+ * Out: return 1 on success else 0 on error
+ * Clobber list : r1, r2, r3, r4
+ * -----------------------------------------------
+ */
+func imx_crash_uart_init
+ /* Free up r1 as a scratch reg */
+ mov r4, r0
+ mov r0, r1
+
+ /* Reset UART via CR2 */
+ add r1, r4, #IMX_UART_CR2_OFFSET
+ movs r3, #0
+ str r3, [r4, #IMX_UART_CR2_OFFSET]
+
+ /* Wait for reset complete */
+__wait_cr2_reset:
+ ldr r3, [r1, #0]
+ ands r3, #IMX_UART_CR2_SRST
+ beq __wait_cr2_reset
+
+ /* Enable UART */
+ movs r3, #IMX_UART_CR1_UARTEN
+ mov r1, r2
+ str r3, [r4, #IMX_UART_CR1_OFFSET]
+
+ /*
+ * Ignore RTC/CTS - disable reset
+ * Magic value #16423 =>
+ * IMX_UART_CR2_IRTS | IMX_UART_CR2_WS | IMX_UART_CR2_TXEN | IMX_UART_CR2_RXEN | IMX_UART_CR2_SRST
+ */
+ movw r3, #16423
+ str r3, [r4, #IMX_UART_CR2_OFFSET]
+
+ /*
+ * No parity, autobaud detect-old, rxdmuxsel=1 (fixed i.mx7)
+ * Magic value => #132
+ * IMX_UART_CR3_ADNIMP | IMX_UART_CR3_RXDMUXSEL
+ */
+ movs r3, #132
+ str r3, [r4, #IMX_UART_CR3_OFFSET]
+
+ /*
+ * Set CTS FIFO trigger to 32 bytes bits 15:10
+ * Magic value => #32768
+ * FIFO trigger bitmask 100000
+ * */
+ mov r3, #32768
+ str r3, [r4, #IMX_UART_CR4_OFFSET]
+
+ /*
+ * TX/RX-thresh = 2 bytes, DCE (bit6 = 0), refclk @24MHz / 4
+ * Magic value #2562
+ * IMX_UART_FCR_TXTL(TX_RX_THRESH) | IMX_UART_FCR_RXTL(TX_RX_THRESH) | IMX_UART_FCR_RFDIV2
+ */
+ #ifdef IMX_UART_DTE
+ movw r3, #2626
+ #else
+ movw r3, #2562
+ #endif
+ str r3, [r4, #IMX_UART_FCR_OFFSET]
+
+ /* This BIR should be set to 0x0F prior to writing the BMR */
+ movs r3, #15
+ str r3, [r4, #IMX_UART_BIR_OFFSET]
+
+ /* Hard-code to 115200 @ 24 MHz */
+ movs r0, #104
+ str r0, [r4, #IMX_UART_BMR_OFFSET]
+
+ /* Indicate success */
+ movs r0, #1
+ bx lr
+endfunc imx_crash_uart_init
+
+ /* --------------------------------------------------------
+ * int imx_crash_uart_putc(int c, uintptr_t base_addr)
+ * Function to output a character over the console. It
+ * returns the character printed on success or -1 on error.
+ * In : r0 - character to be printed
+ * r1 - console base address
+ * Out : return -1 on error else return character.
+ * Clobber list : r2
+ * --------------------------------------------------------
+ */
+func imx_crash_uart_putc
+ /* Output specified character to UART shift-register */
+ str r0, [r1, #IMX_UART_TXD_OFFSET]
+
+ /* Wait for transmit IMX_UART_STAT2_OFFSET.IMX_UART_STAT2_TXDC == 1 */
+__putc_spin_ready:
+ ldr r2, [r1, #IMX_UART_STAT2_OFFSET]
+ ands r2, #IMX_UART_STAT2_TXDC
+ beq __putc_spin_ready
+
+ /* Transmit complete do we need to fixup \n to \n\r */
+ cmp r0, #10
+ beq __putc_fixup_lf
+
+ /* No fixup necessary - exit here */
+ movs r0, #0
+ bx lr
+
+ /* Fixup \n to \n\r */
+__putc_fixup_lf:
+ movs r0, #13
+ b imx_crash_uart_putc
+endfunc imx_crash_uart_putc
diff --git a/drivers/imx/uart/imx_uart.c b/drivers/imx/uart/imx_uart.c
new file mode 100644
index 0000000..dfe2e92
--- /dev/null
+++ b/drivers/imx/uart/imx_uart.c
@@ -0,0 +1,181 @@
+/*
+ * Copyright (c) Linaro 2018 Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <stdint.h>
+
+#include <platform_def.h>
+
+#include <arch.h>
+#include <lib/mmio.h>
+
+#include <imx_uart.h>
+
+/* TX/RX FIFO threshold */
+#define TX_RX_THRESH 2
+
+struct clk_div_factors {
+ uint32_t fcr_div;
+ uint32_t bmr_div;
+};
+
+static struct clk_div_factors clk_div[] = {
+ {
+ .fcr_div = IMX_UART_FCR_RFDIV1,
+ .bmr_div = 1,
+ },
+ {
+ .fcr_div = IMX_UART_FCR_RFDIV2,
+ .bmr_div = 2,
+ },
+ {
+ .fcr_div = IMX_UART_FCR_RFDIV3,
+ .bmr_div = 3,
+ },
+ {
+ .fcr_div = IMX_UART_FCR_RFDIV4,
+ .bmr_div = 4,
+ },
+ {
+ .fcr_div = IMX_UART_FCR_RFDIV5,
+ .bmr_div = 5,
+ },
+ {
+ .fcr_div = IMX_UART_FCR_RFDIV6,
+ .bmr_div = 6,
+ },
+ {
+ .fcr_div = IMX_UART_FCR_RFDIV7,
+ .bmr_div = 7,
+ },
+};
+
+static void write_reg(uintptr_t base, uint32_t offset, uint32_t val)
+{
+ mmio_write_32(base + offset, val);
+}
+
+static uint32_t read_reg(uintptr_t base, uint32_t offset)
+{
+ return mmio_read_32(base + offset);
+}
+
+int console_imx_uart_core_init(uintptr_t base_addr, unsigned int uart_clk,
+ unsigned int baud_rate)
+{
+ uint32_t val;
+ uint8_t clk_idx = 1;
+
+ /* Reset UART */
+ write_reg(base_addr, IMX_UART_CR2_OFFSET, 0);
+ do {
+ val = read_reg(base_addr, IMX_UART_CR2_OFFSET);
+ } while (!(val & IMX_UART_CR2_SRST));
+
+ /* Enable UART */
+ write_reg(base_addr, IMX_UART_CR1_OFFSET, IMX_UART_CR1_UARTEN);
+
+ /* Ignore RTS, 8N1, enable tx/rx, disable reset */
+ val = (IMX_UART_CR2_IRTS | IMX_UART_CR2_WS | IMX_UART_CR2_TXEN |
+ IMX_UART_CR2_RXEN | IMX_UART_CR2_SRST);
+ write_reg(base_addr, IMX_UART_CR2_OFFSET, val);
+
+ /* No parity, autobaud detect-old, rxdmuxsel=1 (fixed i.mx7) */
+ val = IMX_UART_CR3_ADNIMP | IMX_UART_CR3_RXDMUXSEL;
+ write_reg(base_addr, IMX_UART_CR3_OFFSET, val);
+
+ /* Set CTS FIFO trigger to 32 bytes bits 15:10 */
+ write_reg(base_addr, IMX_UART_CR4_OFFSET, 0x8000);
+
+ /* TX/RX-thresh = 2 bytes, DTE (bit6 = 0), refclk @24MHz / 4 */
+ val = IMX_UART_FCR_TXTL(TX_RX_THRESH) | IMX_UART_FCR_RXTL(TX_RX_THRESH) |
+ clk_div[clk_idx].fcr_div;
+ #ifdef IMX_UART_DTE
+ /* Set DTE (bit6 = 1) */
+ val |= IMX_UART_FCR_DCEDTE;
+ #endif
+ write_reg(base_addr, IMX_UART_FCR_OFFSET, val);
+
+ /*
+ * The equation for BAUD rate calculation is
+ * RefClk = Supplied clock / FCR_DIVx
+ *
+ * BAUD = Refclk
+ * ------------
+ * 16 x (UBMR + 1/ UBIR + 1)
+ *
+ * We write 0x0f into UBIR to remove the 16 mult
+ * BAUD = 6000000
+ * ------------
+ * 16 x (UBMR + 1/ 15 + 1)
+ */
+
+ write_reg(base_addr, IMX_UART_BIR_OFFSET, 0x0f);
+ val = ((uart_clk / clk_div[clk_idx].bmr_div) / baud_rate) - 1;
+ write_reg(base_addr, IMX_UART_BMR_OFFSET, val);
+
+ return 0;
+}
+
+/* --------------------------------------------------------
+ * int console_core_putc(int c, uintptr_t base_addr)
+ * Function to output a character over the console. It
+ * returns the character printed on success or -1 on error.
+ * In : r0 - character to be printed
+ * r1 - console base address
+ * Out : return -1 on error else return character.
+ * Clobber list : r2
+ * --------------------------------------------------------
+ */
+int console_imx_uart_core_putc(int c, uintptr_t base_addr)
+{
+ uint32_t val;
+
+ if (c == '\n')
+ console_imx_uart_core_putc('\r', base_addr);
+
+ /* Write data */
+ write_reg(base_addr, IMX_UART_TXD_OFFSET, c);
+
+ /* Wait for transmit */
+ do {
+ val = read_reg(base_addr, IMX_UART_STAT2_OFFSET);
+ } while (!(val & IMX_UART_STAT2_TXDC));
+
+ return 0;
+}
+
+/*
+ * Function to get a character from the console.
+ * It returns the character grabbed on success
+ * or -1 on error.
+ * In : r0 - console base address
+ * Clobber list : r0, r1
+ * ---------------------------------------------
+ */
+int console_imx_uart_core_getc(uintptr_t base_addr)
+{
+ uint32_t val;
+
+ val = read_reg(base_addr, IMX_UART_TS_OFFSET);
+ if (val & IMX_UART_TS_RXEMPTY)
+ return -1;
+
+ val = read_reg(base_addr, IMX_UART_RXD_OFFSET);
+ return (int)(val & 0x000000FF);
+}
+
+/*
+ * Function to force a write of all buffered
+ * data that hasn't been output.
+ * In : r0 - console base address
+ * Out : void
+ * Clobber list : r0, r1
+ * ---------------------------------------------
+ */
+void console_imx_uart_core_flush(uintptr_t base_addr)
+{
+}
+
diff --git a/drivers/imx/uart/imx_uart.h b/drivers/imx/uart/imx_uart.h
new file mode 100644
index 0000000..a133024
--- /dev/null
+++ b/drivers/imx/uart/imx_uart.h
@@ -0,0 +1,163 @@
+/*
+ * Copyright (c) Linaro 2018 Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+#ifndef IMX_UART_H
+#define IMX_UART_H
+
+#include <drivers/console.h>
+
+#define IMX_UART_RXD_OFFSET 0x00
+#define IMX_UART_RXD_CHARRDY BIT(15)
+#define IMX_UART_RXD_ERR BIT(14)
+#define IMX_UART_RXD_OVERRUN BIT(13)
+#define IMX_UART_RXD_FRMERR BIT(12)
+#define IMX_UART_RXD_BRK BIT(11)
+#define IMX_UART_RXD_PRERR BIT(10)
+
+#define IMX_UART_TXD_OFFSET 0x40
+
+#define IMX_UART_CR1_OFFSET 0x80
+#define IMX_UART_CR1_ADEN BIT(15)
+#define IMX_UART_CR1_ADBR BIT(14)
+#define IMX_UART_CR1_TRDYEN BIT(13)
+#define IMX_UART_CR1_IDEN BIT(12)
+#define IMX_UART_CR1_RRDYEN BIT(9)
+#define IMX_UART_CR1_RXDMAEN BIT(8)
+#define IMX_UART_CR1_IREN BIT(7)
+#define IMX_UART_CR1_TXMPTYEN BIT(6)
+#define IMX_UART_CR1_RTSDEN BIT(5)
+#define IMX_UART_CR1_SNDBRK BIT(4)
+#define IMX_UART_CR1_TXDMAEN BIT(3)
+#define IMX_UART_CR1_ATDMAEN BIT(2)
+#define IMX_UART_CR1_DOZE BIT(1)
+#define IMX_UART_CR1_UARTEN BIT(0)
+
+#define IMX_UART_CR2_OFFSET 0x84
+#define IMX_UART_CR2_ESCI BIT(15)
+#define IMX_UART_CR2_IRTS BIT(14)
+#define IMX_UART_CR2_CTSC BIT(13)
+#define IMX_UART_CR2_CTS BIT(12)
+#define IMX_UART_CR2_ESCEN BIT(11)
+#define IMX_UART_CR2_PREN BIT(8)
+#define IMX_UART_CR2_PROE BIT(7)
+#define IMX_UART_CR2_STPB BIT(6)
+#define IMX_UART_CR2_WS BIT(5)
+#define IMX_UART_CR2_RTSEN BIT(4)
+#define IMX_UART_CR2_ATEN BIT(3)
+#define IMX_UART_CR2_TXEN BIT(2)
+#define IMX_UART_CR2_RXEN BIT(1)
+#define IMX_UART_CR2_SRST BIT(0)
+
+#define IMX_UART_CR3_OFFSET 0x88
+#define IMX_UART_CR3_DTREN BIT(13)
+#define IMX_UART_CR3_PARERREN BIT(12)
+#define IMX_UART_CR3_FARERREN BIT(11)
+#define IMX_UART_CR3_DSD BIT(10)
+#define IMX_UART_CR3_DCD BIT(9)
+#define IMX_UART_CR3_RI BIT(8)
+#define IMX_UART_CR3_ADNIMP BIT(7)
+#define IMX_UART_CR3_RXDSEN BIT(6)
+#define IMX_UART_CR3_AIRINTEN BIT(5)
+#define IMX_UART_CR3_AWAKEN BIT(4)
+#define IMX_UART_CR3_DTRDEN BIT(3)
+#define IMX_UART_CR3_RXDMUXSEL BIT(2)
+#define IMX_UART_CR3_INVT BIT(1)
+#define IMX_UART_CR3_ACIEN BIT(0)
+
+#define IMX_UART_CR4_OFFSET 0x8c
+#define IMX_UART_CR4_INVR BIT(9)
+#define IMX_UART_CR4_ENIRI BIT(8)
+#define IMX_UART_CR4_WKEN BIT(7)
+#define IMX_UART_CR4_IDDMAEN BIT(6)
+#define IMX_UART_CR4_IRSC BIT(5)
+#define IMX_UART_CR4_LPBYP BIT(4)
+#define IMX_UART_CR4_TCEN BIT(3)
+#define IMX_UART_CR4_BKEN BIT(2)
+#define IMX_UART_CR4_OREN BIT(1)
+#define IMX_UART_CR4_DREN BIT(0)
+
+#define IMX_UART_FCR_OFFSET 0x90
+#define IMX_UART_FCR_TXTL_MASK (BIT(15) | BIT(14) | BIT(13) | BIT(12) |\
+ BIT(11) | BIT(10))
+#define IMX_UART_FCR_TXTL(x) ((x) << 10)
+#define IMX_UART_FCR_RFDIV_MASK (BIT(9) | BIT(8) | BIT(7))
+#define IMX_UART_FCR_RFDIV7 (BIT(9) | BIT(8))
+#define IMX_UART_FCR_RFDIV1 (BIT(9) | BIT(7))
+#define IMX_UART_FCR_RFDIV2 BIT(9)
+#define IMX_UART_FCR_RFDIV3 (BIT(8) | BIT(7))
+#define IMX_UART_FCR_RFDIV4 BIT(8)
+#define IMX_UART_FCR_RFDIV5 BIT(7)
+#define IMX_UART_FCR_RFDIV6 0
+#define IMX_UART_FCR_DCEDTE BIT(6)
+#define IMX_UART_FCR_RXTL_MASK (BIT(5) | BIT(4) | BIT(3) | BIT(2) |\
+ BIT(1) | BIT(0))
+#define IMX_UART_FCR_RXTL(x) x
+
+#define IMX_UART_STAT1_OFFSET 0x94
+#define IMX_UART_STAT1_PARITYERR BIT(15)
+#define IMX_UART_STAT1_RTSS BIT(14)
+#define IMX_UART_STAT1_TRDY BIT(13)
+#define IMX_UART_STAT1_RTSD BIT(12)
+#define IMX_UART_STAT1_ESCF BIT(11)
+#define IMX_UART_STAT1_FRAMEERR BIT(10)
+#define IMX_UART_STAT1_RRDY BIT(9)
+#define IMX_UART_STAT1_AGTIM BIT(8)
+#define IMX_UART_STAT1_DTRD BIT(7)
+#define IMX_UART_STAT1_RXDS BIT(6)
+#define IMX_UART_STAT1_AIRINT BIT(5)
+#define IMX_UART_STAT1_AWAKE BIT(4)
+#define IMX_UART_STAT1_SAD BIT(3)
+
+#define IMX_UART_STAT2_OFFSET 0x98
+#define IMX_UART_STAT2_ADET BIT(15)
+#define IMX_UART_STAT2_TXFE BIT(14)
+#define IMX_UART_STAT2_DTRF BIT(13)
+#define IMX_UART_STAT2_IDLE BIT(12)
+#define IMX_UART_STAT2_ACST BIT(11)
+#define IMX_UART_STAT2_RIDELT BIT(10)
+#define IMX_UART_STAT2_RIIN BIT(9)
+#define IMX_UART_STAT2_IRINT BIT(8)
+#define IMX_UART_STAT2_WAKE BIT(7)
+#define IMX_UART_STAT2_DCDDELT BIT(6)
+#define IMX_UART_STAT2_DCDIN BIT(5)
+#define IMX_UART_STAT2_RTSF BIT(4)
+#define IMX_UART_STAT2_TXDC BIT(3)
+#define IMX_UART_STAT2_BRCD BIT(2)
+#define IMX_UART_STAT2_ORE BIT(1)
+#define IMX_UART_STAT2_RCR BIT(0)
+
+#define IMX_UART_ESC_OFFSET 0x9c
+
+#define IMX_UART_TIM_OFFSET 0xa0
+
+#define IMX_UART_BIR_OFFSET 0xa4
+
+#define IMX_UART_BMR_OFFSET 0xa8
+
+#define IMX_UART_BRC_OFFSET 0xac
+
+#define IMX_UART_ONEMS_OFFSET 0xb0
+
+#define IMX_UART_TS_OFFSET 0xb4
+#define IMX_UART_TS_FRCPERR BIT(13)
+#define IMX_UART_TS_LOOP BIT(12)
+#define IMX_UART_TS_DBGEN BIT(11)
+#define IMX_UART_TS_LOOPIR BIT(10)
+#define IMX_UART_TS_RXDBG BIT(9)
+#define IMX_UART_TS_TXEMPTY BIT(6)
+#define IMX_UART_TS_RXEMPTY BIT(5)
+#define IMX_UART_TS_TXFULL BIT(4)
+#define IMX_UART_TS_RXFULL BIT(3)
+#define IMX_UART_TS_SOFTRST BIT(0)
+
+#ifndef __ASSEMBLER__
+
+int console_imx_uart_register(uintptr_t baseaddr,
+ uint32_t clock,
+ uint32_t baud,
+ console_t *console);
+#endif /*__ASSEMBLER__*/
+
+#endif /* IMX_UART_H */